flutter_html customRender custom Widget custom tag

 Widget html = Html(

  data: """
  <h3>Display bird element and flutter element <bird></bird></h3>
  <flutter></flutter>
  <flutter horizontal></flutter>
  """,
  customRender: {
      "bird": (RenderContext context, Widget child) {
        return TextSpan(text: "🐦");
      },
      "flutter": (RenderContext context, Widget child) {
        return FlutterLogo(
          style: (context.tree.element!.attributes['horizontal'] != null)
              ? FlutterLogoStyle.horizontal
              : FlutterLogoStyle.markOnly,
          textColor: context.style.color!,
          size: context.style.fontSize!.size! * 5,
        );
      },
    },
  tagsList: Html.tags..addAll(["bird", "flutter"]),
);